Hard Drive not detected in ubuntu 12.04?

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http://askubuntu.com – I had installed Ubuntu 12.04LTS in this summer and all was going fine. But suddenly my brother switched off the computer while it was loading the BIOS. Now when I boot, its not recognizing my hard drive in which I had installed Ubuntu 12.04LTS. I want to get back those files because I have made a project (a Periodic Table) and I have to submit it next month and still 50% of the application is left. I had put in lot of efforts for that and I forgot to take backups. I even tried to boot ubuntu from the live CD but then too its not recognizing the hard drive. And the BIOS is saying "no boot loade (HowTos)